feat(stats): add user group usage views

apps/aether-gateway/src/control/route/admin/observability_families.rs

@@ -596,6 +596,20 @@ pub(super) fn classify_admin_observability_family_route(
             "admin:stats",
             false,
         ))
+    } else if method == http::Method::GET
+        && matches!(
+            normalized_path,
+            "/api/admin/stats/leaderboard/user-groups"
+                | "/api/admin/stats/leaderboard/user-groups/"
+        )
+    {
+        Some(classified(
+            "admin_proxy",
+            "stats_manage",
+            "leaderboard_user_groups",
+            "admin:stats",
+            false,
+        ))
     } else if method == http::Method::GET
         && matches!(
             normalized_path,

apps/aether-gateway/src/control/tests/admin_stats.rs

@@ -157,6 +157,28 @@ fn classifies_admin_stats_leaderboard_models_as_admin_proxy_route() {
     assert!(!decision.is_execution_runtime_candidate());
 }
 
+#[test]
+fn classifies_admin_stats_leaderboard_user_groups_as_admin_proxy_route() {
+    let headers = headers(&[]);
+    let uri: Uri = "/api/admin/stats/leaderboard/user-groups"
+        .parse()
+        .expect("uri should parse");
+    let decision =
+        classify_control_route(&http::Method::GET, &uri, &headers).expect("route should classify");
+
+    assert_eq!(decision.route_class.as_deref(), Some("admin_proxy"));
+    assert_eq!(decision.route_family.as_deref(), Some("stats_manage"));
+    assert_eq!(
+        decision.route_kind.as_deref(),
+        Some("leaderboard_user_groups")
+    );
+    assert_eq!(
+        decision.auth_endpoint_signature.as_deref(),
+        Some("admin:stats")
+    );
+    assert!(!decision.is_execution_runtime_candidate());
+}
+
 #[test]
 fn classifies_admin_stats_leaderboard_users_as_admin_proxy_route() {
     let headers = headers(&[]);

apps/aether-gateway/src/handlers/admin/observability/mod.rs

@@ -11,3 +11,31 @@ pub(crate) use self::stats::{
 };
 pub(crate) use self::stats::{AdminStatsTimeRange, AdminStatsUsageFilter};
 pub(crate) use self::usage::maybe_build_local_admin_usage_response;
+
+pub(crate) async fn resolve_usage_user_group_scope(
+    state: &crate::handlers::admin::request::AdminAppState<'_>,
+    query: Option<&str>,
+    include_inactive: bool,
+    exclude_admin: bool,
+) -> Result<Result<Option<Vec<String>>, String>, crate::GatewayError> {
+    let group_id = crate::handlers::admin::shared::query_param_value(query, "user_group_id");
+    let Some(group_id) = group_id else {
+        return Ok(Ok(None));
+    };
+    if crate::handlers::admin::shared::query_param_value(query, "user_id").is_some() {
+        return Ok(Err(
+            "user_id and user_group_id cannot be used together".to_string()
+        ));
+    }
+    if !state.has_user_data_reader() {
+        return Ok(Err("user group data is unavailable".to_string()));
+    }
+
+    match state
+        .resolve_usage_user_group_member_ids(&group_id, include_inactive, exclude_admin)
+        .await?
+    {
+        Some(user_ids) => Ok(Ok(Some(user_ids))),
+        None => Ok(Err("user_group_id does not exist".to_string())),
+    }
+}

apps/aether-gateway/src/handlers/admin/observability/monitoring/activity.rs

@@ -172,6 +172,7 @@ pub(super) async fn build_admin_monitoring_system_status_response(
             created_from_unix_secs: today_start.timestamp().max(0) as u64,
             created_until_unix_secs: now_unix_secs.saturating_add(1),
             user_id: None,
+            user_ids: None,
             provider_name: None,
             model: None,
         })

apps/aether-gateway/src/handlers/admin/observability/stats/analytics_routes.rs

@@ -1,3 +1,4 @@
+use super::super::resolve_usage_user_group_scope;
 use super::range::{build_comparison_range, parse_bounded_u32};
 use super::resolve_admin_usage_time_range;
 use crate::handlers::admin::request::{AdminAppState, AdminRequestContext};
@@ -294,6 +295,17 @@ pub(super) async fn maybe_build_local_admin_stats_analytics_response(
         }
 
         let filters = AdminStatsUsageFilter::from_query(request_context.query_string());
+        let user_ids = match resolve_usage_user_group_scope(
+            state,
+            request_context.query_string(),
+            false,
+            false,
+        )
+        .await?
+        {
+            Ok(value) => value,
+            Err(detail) => return Ok(Some(admin_stats_bad_request_response(detail))),
+        };
         let query_granularity = match granularity {
             AdminStatsGranularity::Hour => UsageTimeSeriesGranularity::Hour,
             AdminStatsGranularity::Day
@@ -311,6 +323,7 @@ pub(super) async fn maybe_build_local_admin_stats_analytics_response(
                 granularity: query_granularity,
                 tz_offset_minutes: time_range.tz_offset_minutes,
                 user_id: filters.user_id,
+                user_ids,
                 provider_name: filters.provider_name,
                 model: filters.model,
             })

apps/aether-gateway/src/handlers/admin/observability/stats/cost_routes.rs

@@ -77,6 +77,7 @@ pub(super) async fn maybe_build_local_admin_stats_cost_response(
                 granularity: UsageTimeSeriesGranularity::Day,
                 tz_offset_minutes: time_range.tz_offset_minutes,
                 user_id: None,
+                user_ids: None,
                 provider_name: None,
                 model: None,
             })

apps/aether-gateway/src/handlers/admin/observability/stats/leaderboard.rs

@@ -3,12 +3,13 @@ use crate::GatewayError;
 use aether_data_contracts::repository::usage::StoredRequestUsageAudit;
 
 pub(super) use aether_admin::observability::stats::{
-    build_admin_stats_leaderboard_response, build_api_key_leaderboard_items,
-    build_api_key_leaderboard_items_from_summaries, build_model_leaderboard_items,
-    build_model_leaderboard_items_from_summaries, build_user_leaderboard_items,
-    build_user_leaderboard_items_from_summaries, compare_leaderboard_items, compute_dense_rank,
-    AdminStatsLeaderboardItem, AdminStatsLeaderboardMetric, AdminStatsLeaderboardNameMode,
-    AdminStatsSortOrder, AdminStatsUserMetadata,
+    build_admin_stats_leaderboard_response, build_admin_stats_user_group_leaderboard_response,
+    build_api_key_leaderboard_items, build_api_key_leaderboard_items_from_summaries,
+    build_model_leaderboard_items, build_model_leaderboard_items_from_summaries,
+    build_user_leaderboard_items, build_user_leaderboard_items_from_summaries,
+    compare_leaderboard_items, compute_dense_rank, AdminStatsLeaderboardItem,
+    AdminStatsLeaderboardMetric, AdminStatsLeaderboardNameMode, AdminStatsSortOrder,
+    AdminStatsUserMetadata,
 };
 
 pub(super) async fn load_user_leaderboard_metadata(

apps/aether-gateway/src/handlers/admin/observability/stats/leaderboard_routes.rs

@@ -1,7 +1,9 @@
+use super::super::resolve_usage_user_group_scope;
 use super::leaderboard::{
-    build_admin_stats_leaderboard_response, build_api_key_leaderboard_items_from_summaries,
-    build_model_leaderboard_items_from_summaries, build_user_leaderboard_items_from_summaries,
-    compare_leaderboard_items, load_user_leaderboard_metadata, AdminStatsLeaderboardNameMode,
+    build_admin_stats_leaderboard_response, build_admin_stats_user_group_leaderboard_response,
+    build_api_key_leaderboard_items_from_summaries, build_model_leaderboard_items_from_summaries,
+    build_user_leaderboard_items_from_summaries, compare_leaderboard_items,
+    load_user_leaderboard_metadata, AdminStatsLeaderboardItem, AdminStatsLeaderboardNameMode,
 };
 use super::range::{parse_bounded_u32, parse_nonnegative_usize};
 use super::resolve_admin_usage_time_range;
@@ -14,6 +16,7 @@ use aether_admin::observability::stats::{
 };
 use aether_data_contracts::repository::usage::{UsageLeaderboardGroupBy, UsageLeaderboardQuery};
 use axum::{body::Body, http, response::Response};
+use std::collections::{BTreeMap, BTreeSet};
 
 pub(super) async fn maybe_build_local_admin_stats_leaderboard_response(
     state: &AdminAppState<'_>,
@@ -79,6 +82,7 @@ pub(super) async fn maybe_build_local_admin_stats_leaderboard_response(
                 created_until_unix_secs,
                 group_by: UsageLeaderboardGroupBy::Model,
                 user_id: filters.user_id,
+                user_ids: None,
                 provider_name: filters.provider_name,
                 model: filters.model,
             })
@@ -156,6 +160,7 @@ pub(super) async fn maybe_build_local_admin_stats_leaderboard_response(
                 created_until_unix_secs,
                 group_by: UsageLeaderboardGroupBy::ApiKey,
                 user_id: filters.user_id,
+                user_ids: None,
                 provider_name: filters.provider_name,
                 model: filters.model,
             })
@@ -206,6 +211,154 @@ pub(super) async fn maybe_build_local_admin_stats_leaderboard_response(
         )));
     }
 
+    if request_context
+        .decision()
+        .and_then(|decision| decision.route_kind.as_deref())
+        == Some("leaderboard_user_groups")
+        && request_context.method() == http::Method::GET
+        && matches!(
+            request_context.path(),
+            "/api/admin/stats/leaderboard/user-groups"
+                | "/api/admin/stats/leaderboard/user-groups/"
+        )
+    {
+        let time_range = match resolve_admin_usage_time_range(query) {
+            Ok(value) => value,
+            Err(detail) => return Ok(Some(admin_stats_bad_request_response(detail))),
+        };
+        let metric = match AdminStatsLeaderboardMetric::parse(query) {
+            Ok(value) => value,
+            Err(detail) => return Ok(Some(admin_stats_bad_request_response(detail))),
+        };
+        let order = match AdminStatsSortOrder::parse(query) {
+            Ok(value) => value,
+            Err(detail) => return Ok(Some(admin_stats_bad_request_response(detail))),
+        };
+        let limit = match query_param_value(query, "limit")
+            .map(|value| parse_bounded_u32("limit", &value, 1, 100))
+            .transpose()
+        {
+            Ok(Some(value)) => value as usize,
+            Ok(None) => 10,
+            Err(detail) => return Ok(Some(admin_stats_bad_request_response(detail))),
+        };
+        let offset = match query_param_value(query, "offset")
+            .map(|value| parse_nonnegative_usize("offset", &value))
+            .transpose()
+        {
+            Ok(Some(value)) => value,
+            Ok(None) => 0,
+            Err(detail) => return Ok(Some(admin_stats_bad_request_response(detail))),
+        };
+        let empty_counts = BTreeMap::new();
+        if !state.has_usage_data_reader() || !state.has_user_data_reader() {
+            return Ok(Some(build_admin_stats_user_group_leaderboard_response(
+                metric,
+                Some(&time_range),
+                &[],
+                &empty_counts,
+                &empty_counts,
+                offset,
+                limit,
+            )));
+        }
+        let include_inactive = query_param_bool(query, "include_inactive", false);
+        let exclude_admin = query_param_bool(query, "exclude_admin", false);
+        let filters = AdminStatsUsageFilter::from_query(query);
+        if filters.user_id.is_some() {
+            return Ok(Some(admin_stats_bad_request_response(
+                "user_id is not supported for the user group leaderboard".to_string(),
+            )));
+        }
+        let Some((created_from_unix_secs, created_until_unix_secs)) = time_range.to_unix_bounds()
+        else {
+            return Ok(Some(build_admin_stats_user_group_leaderboard_response(
+                metric,
+                Some(&time_range),
+                &[],
+                &empty_counts,
+                &empty_counts,
+                offset,
+                limit,
+            )));
+        };
+
+        let summaries = state
+            .summarize_usage_leaderboard(&UsageLeaderboardQuery {
+                created_from_unix_secs,
+                created_until_unix_secs,
+                group_by: UsageLeaderboardGroupBy::User,
+                user_id: None,
+                user_ids: None,
+                provider_name: filters.provider_name,
+                model: filters.model,
+            })
+            .await?;
+        let user_ids = summaries
+            .iter()
+            .map(|item| item.group_key.clone())
+            .collect::<Vec<_>>();
+        let user_metadata = load_user_leaderboard_metadata(state, &user_ids).await?;
+        let user_usage = build_user_leaderboard_items_from_summaries(
+            &summaries,
+            &user_metadata,
+            state.has_auth_user_data_reader(),
+            state.has_user_data_reader(),
+            include_inactive,
+            exclude_admin,
+        )
+        .into_iter()
+        .map(|item| (item.id.clone(), item))
+        .collect::<BTreeMap<_, _>>();
+
+        let mut leaderboard = Vec::new();
+        let mut member_counts = BTreeMap::new();
+        let mut active_member_counts = BTreeMap::new();
+        for group in state.list_user_groups().await? {
+            let members = state.list_user_group_members(&group.id).await?;
+            let member_count = members.iter().filter(|member| !member.is_deleted).count();
+            let active_member_count = members
+                .iter()
+                .filter(|member| !member.is_deleted && member.is_active)
+                .count();
+            let scoped_user_ids = members
+                .iter()
+                .filter(|member| !member.is_deleted)
+                .filter(|member| include_inactive || member.is_active)
+                .filter(|member| !exclude_admin || !member.role.eq_ignore_ascii_case("admin"))
+                .map(|member| member.user_id.as_str())
+                .collect::<BTreeSet<_>>();
+            let mut item = AdminStatsLeaderboardItem {
+                id: group.id.clone(),
+                name: group.name,
+                requests: 0,
+                tokens: 0,
+                cost: 0.0,
+            };
+            for user_id in scoped_user_ids {
+                if let Some(user) = user_usage.get(user_id) {
+                    item.requests = item.requests.saturating_add(user.requests);
+                    item.tokens = item.tokens.saturating_add(user.tokens);
+                    item.cost += user.cost;
+                }
+            }
+            member_counts.insert(group.id.clone(), member_count);
+            active_member_counts.insert(group.id, active_member_count);
+            leaderboard.push(item);
+        }
+        leaderboard.sort_by(|left, right| compare_leaderboard_items(metric, order, left, right));
+
+        return Ok(Some(build_admin_stats_user_group_leaderboard_response(
+            metric,
+            Some(&time_range),
+            &leaderboard,
+            &member_counts,
+            &active_member_counts,
+            offset,
+            limit,
+        )));
+    }
+
     if request_context
         .decision()
         .and_then(|decision| decision.route_kind.as_deref())
@@ -253,6 +406,13 @@ pub(super) async fn maybe_build_local_admin_stats_leaderboard_response(
         let include_inactive = query_param_bool(query, "include_inactive", false);
         let exclude_admin = query_param_bool(query, "exclude_admin", false);
         let filters = AdminStatsUsageFilter::from_query(query);
+        let scoped_user_ids =
+            match resolve_usage_user_group_scope(state, query, include_inactive, exclude_admin)
+                .await?
+            {
+                Ok(value) => value,
+                Err(detail) => return Ok(Some(admin_stats_bad_request_response(detail))),
+            };
         let Some((created_from_unix_secs, created_until_unix_secs)) = time_range.to_unix_bounds()
         else {
             return Ok(Some(admin_stats_leaderboard_empty_response(
@@ -266,6 +426,7 @@ pub(super) async fn maybe_build_local_admin_stats_leaderboard_response(
                 created_until_unix_secs,
                 group_by: UsageLeaderboardGroupBy::User,
                 user_id: filters.user_id,
+                user_ids: scoped_user_ids,
                 provider_name: filters.provider_name,
                 model: filters.model,
             })

apps/aether-gateway/src/handlers/admin/observability/usage/summary_routes.rs

@@ -1,3 +1,4 @@
+use super::super::resolve_usage_user_group_scope;
 use super::super::stats::resolve_admin_usage_time_range;
 use super::analytics::admin_usage_api_key_names;
 use super::analytics::admin_usage_provider_key_names;
@@ -710,11 +711,16 @@ pub(super) async fn maybe_build_local_admin_usage_summary_response(
                     &Default::default(),
                 )));
             };
+            let user_ids = match resolve_usage_user_group_scope(state, query, false, false).await? {
+                Ok(value) => value,
+                Err(detail) => return Ok(Some(admin_usage_bad_request_response(detail))),
+            };
             let summary = state
                 .summarize_usage_audits(&UsageAuditSummaryQuery {
                     created_from_unix_secs,
                     created_until_unix_secs,
                     user_id: query_param_value(query, "user_id"),
+                    user_ids,
                     provider_name: query_param_value(query, "provider"),
                     model: query_param_value(query, "model"),
                 })

apps/aether-gateway/src/handlers/admin/request/users.rs

@@ -126,6 +126,30 @@ impl<'a> AdminAppState<'a> {
         self.app.list_user_group_members(group_id).await
     }
 
+    pub(crate) async fn resolve_usage_user_group_member_ids(
+        &self,
+        group_id: &str,
+        include_inactive: bool,
+        exclude_admin: bool,
+    ) -> Result<Option<Vec<String>>, GatewayError> {
+        if self.find_user_group_by_id(group_id).await?.is_none() {
+            return Ok(None);
+        }
+
+        let mut user_ids = self
+            .list_user_group_members(group_id)
+            .await?
+            .into_iter()
+            .filter(|member| !member.is_deleted)
+            .filter(|member| include_inactive || member.is_active)
+            .filter(|member| !exclude_admin || !member.role.eq_ignore_ascii_case("admin"))
+            .map(|member| member.user_id)
+            .collect::<Vec<_>>();
+        user_ids.sort();
+        user_ids.dedup();
+        Ok(Some(user_ids))
+    }
+
     pub(crate) async fn replace_user_group_members(
         &self,
         group_id: &str,

apps/aether-gateway/src/tests/control/admin/stats.rs

@@ -9,7 +9,8 @@ use aether_data::repository::auth::{
 use aether_data::repository::provider_catalog::InMemoryProviderCatalogReadRepository;
 use aether_data::repository::usage::InMemoryUsageReadRepository;
 use aether_data::repository::users::{
-    InMemoryUserReadRepository, StoredUserAuthRecord, StoredUserSummary,
+    InMemoryUserReadRepository, StoredUserAuthRecord, StoredUserSummary, UpsertUserGroupRecord,
+    UserReadRepository,
 };
 use aether_data_contracts::repository::usage::StoredRequestUsageAudit;
 use async_trait::async_trait;
@@ -1937,6 +1938,135 @@ async fn gateway_handles_admin_stats_leaderboard_users_without_legacy_username_f
     upstream_handle.abort();
 }
 
+#[tokio::test]
+async fn gateway_aggregates_admin_stats_by_current_user_group_membership() {
+    let (_upstream_url, upstream_hits, upstream_handle) =
+        start_stats_upstream("/api/admin/stats/leaderboard/user-groups").await;
+    let usage_repository = Arc::new(InMemoryUsageReadRepository::seed(vec![
+        sample_usage_row(
+            "usage-group-a",
+            "req-group-a",
+            Some("user-1"),
+            Some("key-1"),
+            Some("key-1"),
+            "OpenAI",
+            "gpt-5",
+            60,
+            20,
+            0.4,
+            0.4,
+            DAY_1_UNIX_SECS,
+        ),
+        sample_usage_row(
+            "usage-group-b",
+            "req-group-b",
+            Some("user-2"),
+            Some("key-2"),
+            Some("key-2"),
+            "OpenAI",
+            "gpt-5",
+            40,
+            10,
+            0.35,
+            0.35,
+            DAY_1_UNIX_SECS + 10,
+        ),
+        sample_usage_row(
+            "usage-group-outside",
+            "req-group-outside",
+            Some("user-3"),
+            Some("key-3"),
+            Some("key-3"),
+            "OpenAI",
+            "gpt-5",
+            100,
+            50,
+            1.5,
+            1.5,
+            DAY_1_UNIX_SECS + 20,
+        ),
+    ]));
+    let user_repository = InMemoryUserReadRepository::seed_auth_users([
+        sample_auth_user("user-1", "alice", "user", true),
+        sample_auth_user("user-2", "bob", "user", true),
+        sample_auth_user("user-3", "carol", "user", true),
+    ]);
+    let group = user_repository
+        .create_user_group(UpsertUserGroupRecord {
+            name: "Engineering".to_string(),
+            description: None,
+            priority: 0,
+            allowed_providers: None,
+            allowed_providers_mode: "inherit".to_string(),
+            allowed_api_formats: None,
+            allowed_api_formats_mode: "inherit".to_string(),
+            allowed_models: None,
+            allowed_models_mode: "inherit".to_string(),
+            rate_limit: None,
+            rate_limit_mode: "inherit".to_string(),
+        })
+        .await
+        .expect("group creation should succeed")
+        .expect("group should be created");
+    user_repository
+        .replace_user_group_members(&group.id, &["user-1".to_string(), "user-2".to_string()])
+        .await
+        .expect("group members should be replaced");
+    let data_state = GatewayDataState::with_usage_reader_for_tests(usage_repository)
+        .with_user_reader(Arc::new(user_repository));
+    let gateway = build_router_with_state(
+        AppState::new()
+            .expect("gateway should build")
+            .with_data_state_for_tests(data_state),
+    );
+    let (gateway_url, gateway_handle) = start_server(gateway).await;
+    let client = reqwest::Client::new();
+
+    let response = admin_request(client.get(format!(
+        "{gateway_url}/api/admin/stats/leaderboard/user-groups?start_date=2024-03-21&end_date=2024-03-21&metric=cost&tz_offset_minutes=0"
+    )))
+    .send()
+    .await
+    .expect("group leaderboard request should succeed");
+    assert_eq!(response.status(), StatusCode::OK);
+    let payload: serde_json::Value = response.json().await.expect("json body should parse");
+    assert_eq!(payload["attribution"], "current_membership");
+    assert_eq!(payload["total"], 1);
+    assert_eq!(payload["items"][0]["id"], group.id);
+    assert_eq!(payload["items"][0]["name"], "Engineering");
+    assert_eq!(payload["items"][0]["requests"], 2);
+    assert_eq!(payload["items"][0]["cost"], 0.75);
+    assert_eq!(payload["items"][0]["member_count"], 2);
+    assert_eq!(payload["items"][0]["active_member_count"], 2);
+
+    let response = admin_request(client.get(format!(
+        "{gateway_url}/api/admin/stats/leaderboard/users?start_date=2024-03-21&end_date=2024-03-21&metric=cost&tz_offset_minutes=0&user_group_id={}",
+        group.id
+    )))
+    .send()
+    .await
+    .expect("group member leaderboard request should succeed");
+    assert_eq!(response.status(), StatusCode::OK);
+    let payload: serde_json::Value = response.json().await.expect("json body should parse");
+    assert_eq!(payload["total"], 2);
+    assert!(payload["items"]
+        .as_array()
+        .is_some_and(|items| { items.iter().all(|item| item["id"] != "user-3") }));
+
+    let response = admin_request(client.get(format!(
+        "{gateway_url}/api/admin/stats/leaderboard/users?start_date=2024-03-21&end_date=2024-03-21&user_id=user-1&user_group_id={}",
+        group.id
+    )))
+    .send()
+    .await
+    .expect("conflicting scope request should complete");
+    assert_eq!(response.status(), StatusCode::BAD_REQUEST);
+    assert_eq!(*upstream_hits.lock().expect("mutex should lock"), 0);
+
+    gateway_handle.abort();
+    upstream_handle.abort();
+}
+
 #[tokio::test]
 async fn gateway_handles_admin_stats_leaderboard_users_locally_without_usage_reader() {
     let (upstream_url, upstream_hits, upstream_handle) =

crates/aether-admin/src/observability/stats.rs

@@ -841,6 +841,53 @@ pub fn build_admin_stats_leaderboard_response(
     .into_response()
 }
 
+pub fn build_admin_stats_user_group_leaderboard_response(
+    metric: AdminStatsLeaderboardMetric,
+    time_range: Option<&AdminStatsTimeRange>,
+    leaderboard: &[AdminStatsLeaderboardItem],
+    member_counts: &std::collections::BTreeMap<String, usize>,
+    active_member_counts: &std::collections::BTreeMap<String, usize>,
+    offset: usize,
+    limit: usize,
+) -> Response<Body> {
+    let total = leaderboard.len();
+    let items: Vec<_> = leaderboard
+        .iter()
+        .enumerate()
+        .skip(offset)
+        .take(limit)
+        .map(|(index, item)| {
+            let rank = compute_dense_rank(metric, leaderboard, index);
+            let value = match metric {
+                AdminStatsLeaderboardMetric::Requests => json!(item.requests),
+                AdminStatsLeaderboardMetric::Tokens => json!(item.tokens),
+                AdminStatsLeaderboardMetric::Cost => json!(round_to(item.cost, 6)),
+            };
+            json!({
+                "rank": rank,
+                "id": item.id,
+                "name": item.name,
+                "value": value,
+                "requests": item.requests,
+                "tokens": item.tokens,
+                "cost": round_to(item.cost, 6),
+                "member_count": member_counts.get(&item.id).copied().unwrap_or(0),
+                "active_member_count": active_member_counts.get(&item.id).copied().unwrap_or(0),
+            })
+        })
+        .collect();
+
+    Json(json!({
+        "items": items,
+        "total": total,
+        "metric": metric.as_str(),
+        "start_date": time_range.map(|value| value.start_date.to_string()),
+        "end_date": time_range.map(|value| value.end_date.to_string()),
+        "attribution": "current_membership",
+    }))
+    .into_response()
+}
+
 pub fn build_admin_stats_comparison_response(
     current_usage: &[StoredRequestUsageAudit],
     comparison_usage: &[StoredRequestUsageAudit],

crates/aether-data/adapters/postgres/src/usage/mod.rs

@@ -1857,6 +1857,33 @@ fn usage_leaderboard_sql_fragments(
     }
 }
 
+fn push_usage_user_scope(
+    builder: &mut QueryBuilder<'_, Postgres>,
+    column: &str,
+    user_id: Option<&str>,
+    user_ids: Option<&[String]>,
+) {
+    if let Some(user_id) = user_id {
+        builder
+            .push(" AND ")
+            .push(column)
+            .push(" = ")
+            .push_bind(user_id.to_string());
+    }
+    if let Some(user_ids) = user_ids {
+        if user_ids.is_empty() {
+            builder.push(" AND FALSE");
+        } else {
+            builder.push(" AND ").push(column).push(" IN (");
+            let mut separated = builder.separated(", ");
+            for user_id in user_ids {
+                separated.push_bind(user_id.clone());
+            }
+            separated.push_unseparated(")");
+        }
+    }
+}
+
 const LIST_RECENT_USAGE_AUDITS_PREFIX: &str =
     include_str!("queries/list_recent_usage_audits_prefix.sql");
 
@@ -3625,13 +3652,14 @@ OR (\"usage\".error_message IS NOT NULL AND BTRIM(\"usage\".error_message) <> ''
         start_day_utc: DateTime<Utc>,
         end_day_utc: DateTime<Utc>,
         user_id: Option<&str>,
+        user_ids: Option<&[String]>,
     ) -> Result<StoredUsageAuditSummary, DataLayerError> {
         if start_day_utc >= end_day_utc {
             return Ok(StoredUsageAuditSummary::default());
         }
 
-        let row = if let Some(user_id) = user_id {
-            sqlx::query(
+        let scoped_to_users = user_id.is_some() || user_ids.is_some();
+        let mut builder = QueryBuilder::<Postgres>::new(
             r#"
 SELECT
   COALESCE(SUM(total_requests), 0)::BIGINT AS total_requests,
@@ -3657,57 +3685,27 @@ SELECT
   COALESCE(SUM(cache_read_cost), 0)::DOUBLE PRECISION AS cache_read_cost_usd,
   COALESCE(SUM(response_time_sum_ms), 0)::DOUBLE PRECISION AS total_response_time_ms,
   COALESCE(SUM(error_requests), 0)::BIGINT AS error_requests
-FROM stats_user_daily
-WHERE user_id = $1
-  AND date >= $2
-  AND date < $3
-"#,
-            )
-            .bind(user_id)
-            .bind(start_day_utc)
-            .bind(end_day_utc)
-            .fetch_one(&self.pool)
-            .await
-            .map_postgres_err()?
+FROM "#,
+        );
+        builder.push(if scoped_to_users {
+            "stats_user_daily"
         } else {
-            sqlx::query(
-                r#"
-SELECT
-  COALESCE(SUM(total_requests), 0)::BIGINT AS total_requests,
-  COALESCE(SUM(input_tokens), 0)::BIGINT AS input_tokens,
-  COALESCE(SUM(output_tokens), 0)::BIGINT AS output_tokens,
-  COALESCE(SUM(
-    CASE
-      WHEN effective_input_tokens = 0 AND total_input_context = 0 AND input_tokens > 0
-      THEN input_tokens
-      ELSE effective_input_tokens
-    END
-    + output_tokens + cache_creation_tokens + cache_read_tokens
-  ), 0)::BIGINT AS recorded_total_tokens,
-  COALESCE(SUM(cache_creation_tokens), 0)::BIGINT AS cache_creation_tokens,
-  COALESCE(SUM(cache_creation_ephemeral_5m_tokens), 0)::BIGINT
-    AS cache_creation_ephemeral_5m_tokens,
-  COALESCE(SUM(cache_creation_ephemeral_1h_tokens), 0)::BIGINT
-    AS cache_creation_ephemeral_1h_tokens,
-  COALESCE(SUM(cache_read_tokens), 0)::BIGINT AS cache_read_tokens,
-  COALESCE(SUM(total_cost), 0)::DOUBLE PRECISION AS total_cost_usd,
-  COALESCE(SUM(actual_total_cost), 0)::DOUBLE PRECISION AS actual_total_cost_usd,
-  COALESCE(SUM(cache_creation_cost), 0)::DOUBLE PRECISION AS cache_creation_cost_usd,
-  COALESCE(SUM(cache_read_cost), 0)::DOUBLE PRECISION AS cache_read_cost_usd,
-  COALESCE(SUM(response_time_sum_ms), 0)::DOUBLE PRECISION AS total_response_time_ms,
-  COALESCE(SUM(error_requests), 0)::BIGINT AS error_requests
-FROM stats_daily
-WHERE date >= $1
-  AND date < $2
-"#,
-            )
-            .bind(start_day_utc)
-            .bind(end_day_utc)
+            "stats_daily"
+        });
+        builder
+            .push(" WHERE date >= ")
+            .push_bind(start_day_utc)
+            .push(" AND date < ")
+            .push_bind(end_day_utc);
+        if scoped_to_users {
+            push_usage_user_scope(&mut builder, "user_id", user_id, user_ids);
+        }
+
+        let row = builder
+            .build()
             .fetch_one(&self.pool)
             .await
-            .map_postgres_err()?
-        };
-
+            .map_postgres_err()?;
         decode_usage_audit_summary_row(&row)
     }
 
@@ -3716,6 +3714,7 @@ WHERE date >= $1
         created_from_unix_secs: u64,
         created_until_unix_secs: u64,
         user_id: Option<&str>,
+        user_ids: Option<&[String]>,
         provider_name: Option<&str>,
         model: Option<&str>,
     ) -> Result<StoredUsageAuditSummary, DataLayerError> {
@@ -3770,12 +3769,7 @@ FROM usage_billing_facts AS "usage"
             .push("\"usage\".created_at < TO_TIMESTAMP(")
             .push_bind(created_until_unix_secs as f64)
             .push("::double precision)");
-        if let Some(user_id) = user_id {
-            builder.push(if has_where { " AND " } else { " WHERE " });
-            builder
-                .push("\"usage\".user_id = ")
-                .push_bind(user_id.to_string());
-        }
+        push_usage_user_scope(&mut builder, "\"usage\".user_id", user_id, user_ids);
         if let Some(provider_name) = provider_name {
             builder.push(if has_where { " AND " } else { " WHERE " });
             has_where = true;
@@ -3808,6 +3802,7 @@ FROM usage_billing_facts AS "usage"
                     query.created_from_unix_secs,
                     query.created_until_unix_secs,
                     query.user_id.as_deref(),
+                    query.user_ids.as_deref(),
                     query.provider_name.as_deref(),
                     query.model.as_deref(),
                 )
@@ -3819,6 +3814,7 @@ FROM usage_billing_facts AS "usage"
                     query.created_from_unix_secs,
                     query.created_until_unix_secs,
                     query.user_id.as_deref(),
+                    query.user_ids.as_deref(),
                     None,
                     None,
                 )
@@ -3834,6 +3830,7 @@ FROM usage_billing_facts AS "usage"
                     query.created_from_unix_secs,
                     query.created_until_unix_secs,
                     query.user_id.as_deref(),
+                    query.user_ids.as_deref(),
                     None,
                     None,
                 )
@@ -3848,6 +3845,7 @@ FROM usage_billing_facts AS "usage"
                     dashboard_utc_to_unix_secs(raw_start),
                     dashboard_utc_to_unix_secs(raw_end),
                     query.user_id.as_deref(),
+                    query.user_ids.as_deref(),
                     None,
                     None,
                 )
@@ -3861,6 +3859,7 @@ FROM usage_billing_facts AS "usage"
                     aggregate_start,
                     aggregate_end,
                     query.user_id.as_deref(),
+                    query.user_ids.as_deref(),
                 )
                 .await?,
             );
@@ -3872,6 +3871,7 @@ FROM usage_billing_facts AS "usage"
                     dashboard_utc_to_unix_secs(raw_start),
                     dashboard_utc_to_unix_secs(raw_end),
                     query.user_id.as_deref(),
+                    query.user_ids.as_deref(),
                     None,
                     None,
                 )
@@ -6815,13 +6815,12 @@ FROM usage_billing_facts AS "usage"
             .push("\"usage\".created_at < TO_TIMESTAMP(")
             .push_bind(query.created_until_unix_secs as f64)
             .push("::double precision)");
-        if let Some(user_id) = query.user_id.as_deref() {
-            builder.push(if has_where { " AND " } else { " WHERE " });
-            has_where = true;
-            builder
-                .push("\"usage\".user_id = ")
-                .push_bind(user_id.to_string());
-        }
+        push_usage_user_scope(
+            &mut builder,
+            "\"usage\".user_id",
+            query.user_id.as_deref(),
+            query.user_ids.as_deref(),
+        );
         if let Some(provider_name) = query.provider_name.as_deref() {
             builder.push(if has_where { " AND " } else { " WHERE " });
             has_where = true;
@@ -6861,62 +6860,45 @@ FROM usage_billing_facts AS "usage"
         start_day_utc: DateTime<Utc>,
         end_day_utc: DateTime<Utc>,
         user_id: Option<&str>,
+        user_ids: Option<&[String]>,
     ) -> Result<Vec<StoredUsageTimeSeriesBucket>, DataLayerError> {
         if start_day_utc >= end_day_utc {
             return Ok(Vec::new());
         }
 
-        let rows = if let Some(user_id) = user_id {
-            sqlx::query(
+        let scoped_to_users = user_id.is_some() || user_ids.is_some();
+        let mut builder = QueryBuilder::<Postgres>::new(
             r#"
 SELECT
   TO_CHAR(date, 'YYYY-MM-DD') AS bucket_key,
-  total_requests::BIGINT AS total_requests,
-  input_tokens::BIGINT AS input_tokens,
-  output_tokens::BIGINT AS output_tokens,
-  cache_creation_tokens::BIGINT AS cache_creation_tokens,
-  cache_read_tokens::BIGINT AS cache_read_tokens,
-  CAST(total_cost AS DOUBLE PRECISION) AS total_cost_usd,
-  CAST(response_time_sum_ms AS DOUBLE PRECISION) AS total_response_time_ms
-FROM stats_user_daily
-WHERE user_id = $1
-  AND date >= $2
-  AND date < $3
-ORDER BY date ASC
-"#,
-            )
-            .bind(user_id)
-            .bind(start_day_utc)
-            .bind(end_day_utc)
-            .fetch_all(&self.pool)
-            .await
-            .map_postgres_err()?
+  COALESCE(SUM(total_requests), 0)::BIGINT AS total_requests,
+  COALESCE(SUM(input_tokens), 0)::BIGINT AS input_tokens,
+  COALESCE(SUM(output_tokens), 0)::BIGINT AS output_tokens,
+  COALESCE(SUM(cache_creation_tokens), 0)::BIGINT AS cache_creation_tokens,
+  COALESCE(SUM(cache_read_tokens), 0)::BIGINT AS cache_read_tokens,
+  COALESCE(SUM(CAST(total_cost AS DOUBLE PRECISION)), 0) AS total_cost_usd,
+  COALESCE(SUM(CAST(response_time_sum_ms AS DOUBLE PRECISION)), 0)
+    AS total_response_time_ms
+FROM "#,
+        );
+        builder.push(if scoped_to_users {
+            "stats_user_daily"
         } else {
-            sqlx::query(
-                r#"
-SELECT
-  TO_CHAR(date, 'YYYY-MM-DD') AS bucket_key,
-  total_requests::BIGINT AS total_requests,
-  input_tokens::BIGINT AS input_tokens,
-  output_tokens::BIGINT AS output_tokens,
-  cache_creation_tokens::BIGINT AS cache_creation_tokens,
-  cache_read_tokens::BIGINT AS cache_read_tokens,
-  CAST(total_cost AS DOUBLE PRECISION) AS total_cost_usd,
-  CAST(response_time_sum_ms AS DOUBLE PRECISION) AS total_response_time_ms
-FROM stats_daily
-WHERE date >= $1
-  AND date < $2
-ORDER BY date ASC
-"#,
-            )
-            .bind(start_day_utc)
-            .bind(end_day_utc)
-            .fetch_all(&self.pool)
-            .await
-            .map_postgres_err()?
-        };
+            "stats_daily"
+        });
+        builder
+            .push(" WHERE date >= ")
+            .push_bind(start_day_utc)
+            .push(" AND date < ")
+            .push_bind(end_day_utc);
+        if scoped_to_users {
+            push_usage_user_scope(&mut builder, "user_id", user_id, user_ids);
+        }
+        builder.push(" GROUP BY date ORDER BY date ASC");
+
+        let mut rows = builder.build().fetch(&self.pool);
         let mut items = Vec::new();
-        for row in rows {
+        while let Some(row) = rows.try_next().await.map_postgres_err()? {
             items.push(decode_usage_time_series_bucket_row(&row)?);
         }
         Ok(items)
@@ -7002,6 +6984,7 @@ WHERE is_complete IS TRUE
                                     granularity: UsageTimeSeriesGranularity::Day,
                                     tz_offset_minutes: 0,
                                     user_id: query.user_id.clone(),
+                                    user_ids: query.user_ids.clone(),
                                     provider_name: None,
                                     model: None,
                                 },
@@ -7016,6 +6999,7 @@ WHERE is_complete IS TRUE
                             aggregate_start,
                             aggregate_end,
                             query.user_id.as_deref(),
+                            query.user_ids.as_deref(),
                         )
                         .await?,
                     );
@@ -7028,6 +7012,7 @@ WHERE is_complete IS TRUE
                                 granularity: UsageTimeSeriesGranularity::Day,
                                 tz_offset_minutes: 0,
                                 user_id: query.user_id.clone(),
+                                user_ids: query.user_ids.clone(),
                                 provider_name: None,
                                 model: None,
                             },
@@ -7045,6 +7030,7 @@ WHERE is_complete IS TRUE
                                     granularity: UsageTimeSeriesGranularity::Day,
                                     tz_offset_minutes: 0,
                                     user_id: query.user_id.clone(),
+                                    user_ids: query.user_ids.clone(),
                                     provider_name: None,
                                     model: None,
                                 },
@@ -7058,7 +7044,8 @@ WHERE is_complete IS TRUE
             }
         }
 
-        if query.user_id.is_none() && query.tz_offset_minutes % 60 == 0 {
+        if query.user_id.is_none() && query.user_ids.is_none() && query.tz_offset_minutes % 60 == 0
+        {
             if let Some(cutoff_utc) = self.read_stats_hourly_cutoff().await? {
                 let start_utc = dashboard_unix_secs_to_utc(query.created_from_unix_secs);
                 let end_utc = dashboard_unix_secs_to_utc(query.created_until_unix_secs);
@@ -7075,6 +7062,7 @@ WHERE is_complete IS TRUE
                                     granularity: query.granularity,
                                     tz_offset_minutes: query.tz_offset_minutes,
                                     user_id: None,
+                                    user_ids: None,
                                     provider_name: None,
                                     model: None,
                                 },
@@ -7102,6 +7090,7 @@ WHERE is_complete IS TRUE
                                 granularity: query.granularity,
                                 tz_offset_minutes: query.tz_offset_minutes,
                                 user_id: None,
+                                user_ids: None,
                                 provider_name: None,
                                 model: None,
                             },
@@ -7119,6 +7108,7 @@ WHERE is_complete IS TRUE
                                     granularity: query.granularity,
                                     tz_offset_minutes: query.tz_offset_minutes,
                                     user_id: None,
+                                    user_ids: None,
                                     provider_name: None,
                                     model: None,
                                 },
@@ -7158,6 +7148,7 @@ WHERE "usage".created_at >= TO_TIMESTAMP($1::double precision)
   AND ($3::varchar IS NULL OR "usage".user_id = $3)
   AND ($4::varchar IS NULL OR "usage".provider_name = $4)
   AND ($5::varchar IS NULL OR "usage".model = $5)
+  AND ($6::text[] IS NULL OR "usage".user_id::text = ANY($6))
 GROUP BY group_key
 ORDER BY group_key ASC
 "#,
@@ -7171,6 +7162,7 @@ ORDER BY group_key ASC
             .bind(query.user_id.as_deref())
             .bind(query.provider_name.as_deref())
             .bind(query.model.as_deref())
+            .bind(query.user_ids.clone())
             .fetch(&self.pool);
         let mut items = Vec::new();
         while let Some(row) = rows.try_next().await.map_postgres_err()? {
@@ -7314,11 +7306,12 @@ WHERE date >=
                         .push_bind(end_day_utc)
                         .push(" AND provider_name = ")
                         .push_bind(provider_name.to_string());
-                    if let Some(user_id) = query.user_id.as_deref() {
-                        builder
-                            .push(" AND user_id = ")
-                            .push_bind(user_id.to_string());
-                    }
+                    push_usage_user_scope(
+                        &mut builder,
+                        "user_id",
+                        query.user_id.as_deref(),
+                        query.user_ids.as_deref(),
+                    );
                     builder.push(" GROUP BY user_id ORDER BY user_id ASC");
                     builder
                 } else if let Some(model) = query.model.as_deref() {
@@ -7340,11 +7333,12 @@ WHERE date >=
                         .push_bind(end_day_utc)
                         .push(" AND model = ")
                         .push_bind(model.to_string());
-                    if let Some(user_id) = query.user_id.as_deref() {
-                        builder
-                            .push(" AND user_id = ")
-                            .push_bind(user_id.to_string());
-                    }
+                    push_usage_user_scope(
+                        &mut builder,
+                        "user_id",
+                        query.user_id.as_deref(),
+                        query.user_ids.as_deref(),
+                    );
                     builder.push(" GROUP BY user_id ORDER BY user_id ASC");
                     builder
                 } else {
@@ -7368,11 +7362,12 @@ WHERE date >=
                         .push(" AND date < ")
                         .push_bind(end_day_utc)
                         .push(" AND user_id IS NOT NULL");
-                    if let Some(user_id) = query.user_id.as_deref() {
-                        builder
-                            .push(" AND user_id = ")
-                            .push_bind(user_id.to_string());
-                    }
+                    push_usage_user_scope(
+                        &mut builder,
+                        "user_id",
+                        query.user_id.as_deref(),
+                        query.user_ids.as_deref(),
+                    );
                     builder.push(" GROUP BY user_id ORDER BY user_id ASC");
                     builder
                 };

crates/aether-data/adapters/postgres/src/usage/tests.rs

@@ -3251,13 +3251,15 @@ fn usage_sql_canonical_openai_cache_case_preserves_effective_and_total_tokens()
         aggregate_audit_summary
             .matches("WHEN effective_input_tokens = 0 AND total_input_context = 0")
             .count(),
-        2
+        1,
+        "the shared daily aggregate query should define the legacy token fallback once"
     );
     assert_eq!(
         aggregate_audit_summary
             .matches("+ output_tokens + cache_creation_tokens + cache_read_tokens")
             .count(),
-        2
+        1,
+        "the shared daily aggregate query should define canonical total tokens once"
     );
     assert!(!aggregate_audit_summary.contains("SUM(input_tokens + output_tokens)"));
 

crates/aether-data/contracts/src/repository/usage/types.rs

@@ -1063,6 +1063,9 @@ pub struct UsageAuditSummaryQuery {
     pub created_from_unix_secs: u64,
     pub created_until_unix_secs: u64,
     pub user_id: Option<String>,
+    /// Optional bulk user scope used by current user-group reporting.
+    /// An empty list intentionally matches no usage rows.
+    pub user_ids: Option<Vec<String>>,
     pub provider_name: Option<String>,
     pub model: Option<String>,
 }
@@ -1455,6 +1458,9 @@ pub struct UsageTimeSeriesQuery {
     pub granularity: UsageTimeSeriesGranularity,
     pub tz_offset_minutes: i32,
     pub user_id: Option<String>,
+    /// Optional bulk user scope used by current user-group reporting.
+    /// An empty list intentionally matches no usage rows.
+    pub user_ids: Option<Vec<String>>,
     pub provider_name: Option<String>,
     pub model: Option<String>,
 }
@@ -1485,6 +1491,9 @@ pub struct UsageLeaderboardQuery {
     pub created_until_unix_secs: u64,
     pub group_by: UsageLeaderboardGroupBy,
     pub user_id: Option<String>,
+    /// Optional bulk user scope used by current user-group reporting.
+    /// An empty list intentionally matches no usage rows.
+    pub user_ids: Option<Vec<String>>,
     pub provider_name: Option<String>,
     pub model: Option<String>,
 }

crates/aether-data/runtime/src/lifecycle/migrate/tests.rs

@@ -2388,6 +2388,7 @@ INSERT INTO public.stats_daily_api_key (
             .expect("historical stats end should be nonnegative"),
         group_by: UsageLeaderboardGroupBy::ApiKey,
         user_id: Some("leaderboard-owner".to_string()),
+        user_ids: None,
         provider_name: None,
         model: None,
     };

crates/aether-data/runtime/src/repository/usage/memory.rs

@@ -493,6 +493,15 @@ fn usage_matches_summary_query(
             return false;
         }
     }
+    if let Some(user_ids) = query.user_ids.as_deref() {
+        if !item
+            .user_id
+            .as_ref()
+            .is_some_and(|user_id| user_ids.contains(user_id))
+        {
+            return false;
+        }
+    }
     if let Some(provider_name) = query.provider_name.as_deref() {
         if item.provider_name != provider_name {
             return false;
@@ -520,6 +529,15 @@ fn usage_matches_time_series_query(
             return false;
         }
     }
+    if let Some(user_ids) = query.user_ids.as_deref() {
+        if !item
+            .user_id
+            .as_ref()
+            .is_some_and(|user_id| user_ids.contains(user_id))
+        {
+            return false;
+        }
+    }
     if let Some(provider_name) = query.provider_name.as_deref() {
         if item.provider_name != provider_name {
             return false;
@@ -891,6 +909,15 @@ fn usage_matches_leaderboard_query(
             return false;
         }
     }
+    if let Some(user_ids) = query.user_ids.as_deref() {
+        if !item
+            .user_id
+            .as_ref()
+            .is_some_and(|user_id| user_ids.contains(user_id))
+        {
+            return false;
+        }
+    }
     if let Some(provider_name) = query.provider_name.as_deref() {
         if item.provider_name != provider_name {
             return false;

crates/aether-data/runtime/src/repository/usage/memory/tests.rs

@@ -18,7 +18,7 @@ use aether_data_contracts::repository::usage::{
     UsageAuditAggregationQuery, UsageAuditKeywordSearchQuery, UsageAuditListQuery,
     UsageAuditSummaryQuery, UsageBodyCaptureState, UsageBodyField, UsageDashboardSummaryQuery,
     UsageLeaderboardGroupBy, UsageLeaderboardQuery, UsageProviderPerformanceQuery,
-    UsageTimeSeriesGranularity,
+    UsageTimeSeriesGranularity, UsageTimeSeriesQuery,
 };
 use serde_json::json;
 
@@ -2217,6 +2217,7 @@ async fn dashboard_and_leaderboard_total_tokens_use_effective_cache_aware_tokens
             created_until_unix_secs: 1_711_000_001,
             group_by: UsageLeaderboardGroupBy::User,
             user_id: None,
+            user_ids: None,
             provider_name: None,
             model: None,
         })
@@ -2226,6 +2227,64 @@ async fn dashboard_and_leaderboard_total_tokens_use_effective_cache_aware_tokens
     assert_eq!(leaderboard[0].total_tokens, 120);
 }
 
+#[tokio::test]
+async fn usage_analytics_filters_by_multiple_user_ids() {
+    let user_one = sample_usage("req-user-1", 1_711_000_000);
+    let mut user_two = sample_usage("req-user-2", 1_711_000_000);
+    user_two.user_id = Some("user-2".to_string());
+    let mut user_three = sample_usage("req-user-3", 1_711_000_000);
+    user_three.user_id = Some("user-3".to_string());
+    let repository = InMemoryUsageReadRepository::seed(vec![user_one, user_two, user_three]);
+    let scoped_user_ids = vec!["user-1".to_string(), "user-2".to_string()];
+
+    let summary = repository
+        .summarize_usage_audits(&UsageAuditSummaryQuery {
+            created_from_unix_secs: 1_711_000_000,
+            created_until_unix_secs: 1_711_000_001,
+            user_ids: Some(scoped_user_ids.clone()),
+            ..Default::default()
+        })
+        .await
+        .expect("summary should filter by multiple users");
+    assert_eq!(summary.total_requests, 2);
+
+    let buckets = repository
+        .summarize_usage_time_series(&UsageTimeSeriesQuery {
+            created_from_unix_secs: 1_711_000_000,
+            created_until_unix_secs: 1_711_000_001,
+            granularity: UsageTimeSeriesGranularity::Day,
+            tz_offset_minutes: 0,
+            user_id: None,
+            user_ids: Some(scoped_user_ids.clone()),
+            provider_name: None,
+            model: None,
+        })
+        .await
+        .expect("time series should filter by multiple users");
+    assert_eq!(
+        buckets
+            .iter()
+            .map(|bucket| bucket.total_requests)
+            .sum::<u64>(),
+        2
+    );
+
+    let leaderboard = repository
+        .summarize_usage_leaderboard(&UsageLeaderboardQuery {
+            created_from_unix_secs: 1_711_000_000,
+            created_until_unix_secs: 1_711_000_001,
+            group_by: UsageLeaderboardGroupBy::User,
+            user_id: None,
+            user_ids: Some(scoped_user_ids),
+            provider_name: None,
+            model: None,
+        })
+        .await
+        .expect("leaderboard should filter by multiple users");
+    assert_eq!(leaderboard.len(), 2);
+    assert!(leaderboard.iter().all(|item| item.group_key != "user-3"));
+}
+
 #[tokio::test]
 async fn summarizes_provider_api_key_last_used_at_in_seconds() {
     let repository = InMemoryUsageReadRepository::seed(vec![

frontend/src/api/__tests__/admin-analytics-cache.spec.ts

@@ -82,4 +82,35 @@ describe('adminApi analytics cache options', () => {
     })
     expect(getMock).toHaveBeenNthCalledWith(4, '/api/admin/stats/errors/distribution', { params })
   })
+
+  it('requests the user group leaderboard with scoped cache parameters', async () => {
+    const groupParams = {
+      ...params,
+      metric: 'cost' as const,
+      offset: 10,
+      limit: 10,
+      include_inactive: true,
+    }
+    getMock.mockResolvedValueOnce({
+      data: { items: [], total: 0, metric: 'cost', attribution: 'current_membership' },
+    })
+
+    await expect(adminApi.getLeaderboardUserGroups(groupParams)).resolves.toMatchObject({
+      attribution: 'current_membership',
+    })
+
+    expect(buildCacheKeyMock).toHaveBeenCalledWith(
+      'admin:stats:leaderboard:user-groups',
+      groupParams
+    )
+    expect(cachedRequestMock).toHaveBeenCalledWith(
+      'admin:stats:leaderboard:user-groups',
+      expect.any(Function),
+      20 * 1000
+    )
+    expect(getMock).toHaveBeenCalledWith('/api/admin/stats/leaderboard/user-groups', {
+      params: groupParams,
+    })
+  })
+
 })

frontend/src/api/admin.ts

@@ -709,6 +709,8 @@ export interface LeaderboardItem {
   requests: number
   tokens: number
   cost: number
+  member_count?: number
+  active_member_count?: number
 }
 
 export interface LeaderboardResponse {
@@ -717,6 +719,7 @@ export interface LeaderboardResponse {
   metric: string
   start_date?: string | null
   end_date?: string | null
+  attribution?: 'current_membership'
 }
 
 export interface CostForecastResponse {
@@ -1298,6 +1301,7 @@ export const adminApi = {
     model?: string
     include_inactive?: boolean
     exclude_admin?: boolean
+    user_group_id?: string
   }): Promise<LeaderboardResponse> {
     const cacheKey = buildCacheKey('admin:stats:leaderboard:users', params)
     return cachedRequest(
@@ -1312,6 +1316,35 @@ export const adminApi = {
     )
   },
 
+  async getLeaderboardUserGroups(params?: {
+    start_date?: string
+    end_date?: string
+    preset?: string
+    timezone?: string
+    tz_offset_minutes?: number
+    metric?: 'requests' | 'tokens' | 'cost'
+    order?: 'asc' | 'desc'
+    limit?: number
+    offset?: number
+    provider_name?: string
+    model?: string
+    include_inactive?: boolean
+    exclude_admin?: boolean
+  }): Promise<LeaderboardResponse> {
+    const cacheKey = buildCacheKey('admin:stats:leaderboard:user-groups', params)
+    return cachedRequest(
+      cacheKey,
+      async () => {
+        const response = await apiClient.get<LeaderboardResponse>(
+          '/api/admin/stats/leaderboard/user-groups',
+          { params }
+        )
+        return response.data
+      },
+      20 * 1000
+    )
+  },
+
   async getLeaderboardApiKeys(params?: {
     start_date?: string
     end_date?: string
@@ -1595,6 +1628,7 @@ export const adminApi = {
       timezone?: string
       tz_offset_minutes?: number
       user_id?: string
+      user_group_id?: string
       model?: string
       provider_name?: string
     },

frontend/src/api/usage.ts

@@ -134,6 +134,7 @@ export interface UsageByApiFormat {
 
 export interface UsageFilters {
   user_id?: string // UUID
+  user_group_id?: string // UUID
   provider_id?: string // UUID
   model?: string
   search?: string

frontend/src/components/stats/LeaderboardTable.vue

@@ -8,17 +8,17 @@
           @update:model-value="emitMetric"
         >
           <SelectTrigger class="h-8 text-xs w-28">
-            <SelectValue placeholder="指标" />
+            <SelectValue :placeholder="t('stats.metric.placeholder')" />
           </SelectTrigger>
           <SelectContent>
             <SelectItem value="requests">
-              请求数
+              {{ t('stats.metric.requests') }}
             </SelectItem>
             <SelectItem value="tokens">
-              Tokens
+              {{ t('stats.metric.tokens') }}
             </SelectItem>
             <SelectItem value="cost">
-              成本
+              {{ t('stats.metric.cost') }}
             </SelectItem>
           </SelectContent>
         </Select>
@@ -36,25 +36,31 @@
       class="p-6"
     >
       <EmptyState
-        title="暂无数据"
-        description="当前时间范围内没有统计结果"
+        :title="t('stats.empty.title')"
+        :description="t('stats.empty.description')"
       />
     </div>
     <Table v-else>
       <TableHeader>
         <TableRow>
           <TableHead class="w-16">
-            排名
+            {{ t('stats.column.rank') }}
           </TableHead>
-          <TableHead>名称</TableHead>
-          <TableHead class="text-right">
-            请求数
+          <TableHead>{{ t('stats.column.name') }}</TableHead>
+          <TableHead
+            v-if="showMemberCount"
+            class="text-right"
+          >
+            {{ t('stats.column.members') }}
           </TableHead>
           <TableHead class="text-right">
-            Tokens
+            {{ t('stats.metric.requests') }}
           </TableHead>
           <TableHead class="text-right">
-            成本
+            {{ t('stats.metric.tokens') }}
+          </TableHead>
+          <TableHead class="text-right">
+            {{ t('stats.metric.cost') }}
           </TableHead>
         </TableRow>
       </TableHeader>
@@ -62,11 +68,22 @@
         <TableRow
           v-for="item in items"
           :key="item.id"
+          :class="selectable ? 'cursor-pointer hover:bg-muted/60 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring' : undefined"
+          :tabindex="selectable ? 0 : undefined"
+          @click="selectable && emit('select', item)"
+          @keydown.enter.prevent="selectable && emit('select', item)"
+          @keydown.space.prevent="selectable && emit('select', item)"
         >
           <TableCell class="font-medium">
             {{ item.rank }}
           </TableCell>
           <TableCell>{{ item.name }}</TableCell>
+          <TableCell
+            v-if="showMemberCount"
+            class="text-right"
+          >
+            {{ item.active_member_count ?? 0 }} / {{ item.member_count ?? 0 }}
+          </TableCell>
           <TableCell class="text-right">
             {{ item.requests }}
           </TableCell>
@@ -102,6 +119,7 @@ import {
   TableRow
 } from '@/components/ui'
 import { formatCurrency, formatTokens } from '@/utils/format'
+import { useI18n } from '@/i18n'
 import type { LeaderboardItem } from '@/api/admin'
 
 interface Props {
@@ -110,17 +128,24 @@ interface Props {
   metric: 'requests' | 'tokens' | 'cost'
   loading?: boolean
   showMetricSelect?: boolean
+  showMemberCount?: boolean
+  selectable?: boolean
 }
 
 const props = withDefaults(defineProps<Props>(), {
   loading: false,
-  showMetricSelect: true
+  showMetricSelect: true,
+  showMemberCount: false,
+  selectable: false
 })
 
 const emit = defineEmits<{
   (e: 'update:metric', value: 'requests' | 'tokens' | 'cost'): void
+  (e: 'select', value: LeaderboardItem): void
 }>()
 
+const { t } = useI18n()
+
 const metric = computed(() => props.metric)
 
 function emitMetric(value: string) {

frontend/src/i18n/messages.ts

@@ -346,6 +346,44 @@ export const messages = {
     'nav.usageStats': '使用统计',
     'nav.operations': '运维总览',
     'nav.userStats': '用户统计',
+    'userStats.title': '用户统计',
+    'userStats.description': '按用户或当前用户组成员查看排行榜与使用趋势',
+    'userStats.scope.placeholder': '统计维度',
+    'userStats.scope.user': '按用户',
+    'userStats.scope.userGroup': '按用户组',
+    'userStats.search.user': '搜索用户',
+    'userStats.search.userGroup': '搜索用户组',
+    'userStats.select.user': '选择用户',
+    'userStats.select.userGroup': '选择用户组',
+    'userStats.compare.placeholder': '对比对象（可选）',
+    'userStats.compare.none': '不对比',
+    'userStats.leaderboard.user': '用户排行榜',
+    'userStats.leaderboard.userGroup': '用户组排行榜',
+    'userStats.pagination.summary': '共 {total} 项 · 第 {page} 页',
+    'userStats.pagination.previous': '上一页',
+    'userStats.pagination.next': '下一页',
+    'userStats.summary.user': '用户摘要',
+    'userStats.summary.userGroup': '用户组摘要',
+    'userStats.selectPrompt': '请选择统计对象',
+    'userStats.members.current': '当前成员',
+    'userStats.members.active': '活跃成员',
+    'userStats.memberLeaderboard': '组内成员排行',
+    'userStats.trend.user': '用户使用趋势',
+    'userStats.trend.userGroup': '用户组使用趋势',
+    'userStats.comparisonTrend.user': '用户对比趋势',
+    'userStats.comparisonTrend.userGroup': '用户组对比趋势',
+    'userStats.chart.current': '当前对象',
+    'userStats.chart.comparison': '对比对象',
+    'stats.metric.placeholder': '指标',
+    'stats.metric.requests': '请求数',
+    'stats.metric.tokens': 'Tokens',
+    'stats.metric.cost': '成本',
+    'stats.metric.errorRate': '错误率',
+    'stats.empty.title': '暂无数据',
+    'stats.empty.description': '当前时间范围内没有统计结果',
+    'stats.column.rank': '排名',
+    'stats.column.name': '名称',
+    'stats.column.members': '成员',
     'nav.costAnalysis': '成本分析',
     'nav.performanceAnalysis': '性能分析',
     'nav.userManagement': '用户管理',
@@ -792,6 +830,44 @@ export const messages = {
     'nav.usageStats': 'Usage stats',
     'nav.operations': 'Operations',
     'nav.userStats': 'User stats',
+    'userStats.title': 'User statistics',
+    'userStats.description': 'View leaderboards and usage trends by user or current user-group membership',
+    'userStats.scope.placeholder': 'Statistics scope',
+    'userStats.scope.user': 'By user',
+    'userStats.scope.userGroup': 'By user group',
+    'userStats.search.user': 'Search users',
+    'userStats.search.userGroup': 'Search user groups',
+    'userStats.select.user': 'Select a user',
+    'userStats.select.userGroup': 'Select a user group',
+    'userStats.compare.placeholder': 'Comparison (optional)',
+    'userStats.compare.none': 'No comparison',
+    'userStats.leaderboard.user': 'User leaderboard',
+    'userStats.leaderboard.userGroup': 'User-group leaderboard',
+    'userStats.pagination.summary': '{total} items · Page {page}',
+    'userStats.pagination.previous': 'Previous',
+    'userStats.pagination.next': 'Next',
+    'userStats.summary.user': 'User summary',
+    'userStats.summary.userGroup': 'User-group summary',
+    'userStats.selectPrompt': 'Select a statistics entity',
+    'userStats.members.current': 'Current members',
+    'userStats.members.active': 'Active members',
+    'userStats.memberLeaderboard': 'Group member leaderboard',
+    'userStats.trend.user': 'User usage trend',
+    'userStats.trend.userGroup': 'User-group usage trend',
+    'userStats.comparisonTrend.user': 'User comparison trend',
+    'userStats.comparisonTrend.userGroup': 'User-group comparison trend',
+    'userStats.chart.current': 'Current entity',
+    'userStats.chart.comparison': 'Comparison entity',
+    'stats.metric.placeholder': 'Metric',
+    'stats.metric.requests': 'Requests',
+    'stats.metric.tokens': 'Tokens',
+    'stats.metric.cost': 'Cost',
+    'stats.metric.errorRate': 'Error rate',
+    'stats.empty.title': 'No data',
+    'stats.empty.description': 'No statistics are available for the current time range',
+    'stats.column.rank': 'Rank',
+    'stats.column.name': 'Name',
+    'stats.column.members': 'Members',
     'nav.costAnalysis': 'Cost analysis',
     'nav.performanceAnalysis': 'Performance analysis',
     'nav.userManagement': 'Users',

frontend/src/views/admin/UserStats.vue

@@ -1,70 +1,117 @@
 <template>
   <div class="space-y-6 px-4 sm:px-6 lg:px-0">
-    <div class="flex flex-col sm:flex-row sm:items-center sm:justify-between gap-3">
+    <div class="flex flex-col gap-4 xl:flex-row xl:items-start xl:justify-between">
       <div>
         <h1 class="text-lg font-semibold">
-          用户统计
+          {{ t('userStats.title') }}
         </h1>
         <p class="text-xs text-muted-foreground">
-          查看用户排行榜与使用趋势
+          {{ t('userStats.description') }}
         </p>
       </div>
-      <div class="flex flex-wrap items-center gap-3">
+      <div class="flex flex-wrap items-center gap-2">
+        <Select v-model="scope">
+          <SelectTrigger class="h-8 w-32 text-xs">
+            <SelectValue :placeholder="t('userStats.scope.placeholder')" />
+          </SelectTrigger>
+          <SelectContent>
+            <SelectItem value="user">
+              {{ t('userStats.scope.user') }}
+            </SelectItem>
+            <SelectItem value="user_group">
+              {{ t('userStats.scope.userGroup') }}
+            </SelectItem>
+          </SelectContent>
+        </Select>
+        <Select v-model="selectedEntityId">
+          <SelectTrigger class="h-8 w-52 text-xs">
+            <SelectValue :placeholder="scope === 'user' ? t('userStats.select.user') : t('userStats.select.userGroup')" />
+          </SelectTrigger>
+          <SelectContent
+            :search-threshold="0"
+            :search-placeholder="scope === 'user' ? t('userStats.search.user') : t('userStats.search.userGroup')"
+          >
+            <SelectItem
+              v-for="entity in allEntities"
+              :key="entity.id"
+              :value="entity.id"
+            >
+              {{ entity.name }}
+            </SelectItem>
+          </SelectContent>
+        </Select>
+        <Select v-model="compareEntityId">
+          <SelectTrigger class="h-8 w-52 text-xs">
+            <SelectValue :placeholder="t('userStats.compare.placeholder')" />
+          </SelectTrigger>
+          <SelectContent
+            :search-threshold="0"
+            :search-placeholder="scope === 'user' ? t('userStats.search.user') : t('userStats.search.userGroup')"
+          >
+            <SelectItem value="__none__">
+              {{ t('userStats.compare.none') }}
+            </SelectItem>
+            <SelectItem
+              v-for="entity in comparisonEntities"
+              :key="`compare-${entity.id}`"
+              :value="entity.id"
+            >
+              {{ entity.name }}
+            </SelectItem>
+          </SelectContent>
+        </Select>
         <TimeRangePicker
           v-model="timeRange"
           :allow-hourly="true"
         />
-        <Select
-          v-model="selectedUserId"
-        >
-          <SelectTrigger class="h-8 text-xs w-52">
-            <SelectValue placeholder="选择用户" />
-          </SelectTrigger>
-          <SelectContent>
-            <SelectItem
-              v-for="user in users"
-              :key="user.id"
-              :value="user.id"
-            >
-              {{ user.username || user.email }}
-            </SelectItem>
-          </SelectContent>
-        </Select>
-        <Select
-          v-model="compareUserId"
-        >
-          <SelectTrigger class="h-8 text-xs w-52">
-            <SelectValue placeholder="对比用户（可选）" />
-          </SelectTrigger>
-          <SelectContent>
-            <SelectItem value="__none__">
-              不对比
-            </SelectItem>
-            <SelectItem
-              v-for="user in users"
-              :key="`compare-${user.id}`"
-              :value="user.id"
-            >
-              {{ user.username || user.email }}
-            </SelectItem>
-          </SelectContent>
-        </Select>
       </div>
     </div>
 
-    <div class="grid grid-cols-1 lg:grid-cols-2 gap-4">
+    <div class="grid grid-cols-1 gap-4 lg:grid-cols-2">
       <LeaderboardTable
-        title="用户排行榜"
+        :title="scope === 'user' ? t('userStats.leaderboard.user') : t('userStats.leaderboard.userGroup')"
         :items="leaderboard"
         :metric="metric"
         :loading="leaderboardLoading"
+        :show-member-count="scope === 'user_group'"
+        selectable
         @update:metric="metric = $event"
-      />
+        @select="selectLeaderboardItem"
+      >
+        <template #pagination>
+          <div class="flex items-center justify-between border-t px-4 py-3 text-xs text-muted-foreground">
+            <span>{{ t('userStats.pagination.summary', { total: leaderboardTotal, page: currentPage }) }}</span>
+            <div class="flex gap-2">
+              <Button
+                variant="outline"
+                size="sm"
+                :disabled="leaderboardOffset === 0 || leaderboardLoading"
+                @click="changeLeaderboardPage(-1)"
+              >
+                {{ t('userStats.pagination.previous') }}
+              </Button>
+              <Button
+                variant="outline"
+                size="sm"
+                :disabled="!hasNextLeaderboardPage || leaderboardLoading"
+                @click="changeLeaderboardPage(1)"
+              >
+                {{ t('userStats.pagination.next') }}
+              </Button>
+            </div>
+          </div>
+        </template>
+      </LeaderboardTable>
 
-      <Card class="p-4 space-y-3">
+      <Card class="space-y-3 p-4">
+        <div>
           <h3 class="text-sm font-semibold">
-          用户摘要
+            {{ scope === 'user' ? t('userStats.summary.user') : t('userStats.summary.userGroup') }}
           </h3>
+          <p class="mt-0.5 truncate text-xs text-muted-foreground">
+            {{ selectedEntityName || t('userStats.selectPrompt') }}
+          </p>
+        </div>
         <div
           v-if="summaryLoading"
           class="p-6"
@@ -77,44 +124,78 @@
         >
           <div>
             <div class="text-xs text-muted-foreground">
-              请求数
+              {{ t('stats.metric.requests') }}
             </div>
             <div class="font-semibold">
-              {{ userSummary?.total_requests ?? 0 }}
+              {{ usageSummary?.total_requests ?? 0 }}
             </div>
           </div>
           <div>
             <div class="text-xs text-muted-foreground">
-              Tokens
+              {{ t('stats.metric.tokens') }}
             </div>
             <div class="font-semibold">
-              {{ formatTokens(userSummary?.total_tokens ?? 0) }}
+              {{ formatTokens(usageSummary?.total_tokens ?? 0) }}
             </div>
           </div>
           <div>
             <div class="text-xs text-muted-foreground">
-              成本
+              {{ t('stats.metric.cost') }}
             </div>
             <div class="font-semibold">
-              {{ formatCurrency(userSummary?.total_cost ?? 0) }}
+              {{ formatCurrency(usageSummary?.total_cost ?? 0) }}
             </div>
           </div>
           <div>
             <div class="text-xs text-muted-foreground">
-              错误率
+              {{ t('stats.metric.errorRate') }}
             </div>
             <div class="font-semibold">
-              {{ userSummary?.error_rate ?? 0 }}%
+              {{ usageSummary?.error_rate ?? 0 }}%
             </div>
           </div>
+          <template v-if="scope === 'user_group'">
+            <div>
+              <div class="text-xs text-muted-foreground">
+                {{ t('userStats.members.current') }}
+              </div>
+              <div class="font-semibold">
+                {{ groupMemberCount }}
+              </div>
+            </div>
+            <div>
+              <div class="text-xs text-muted-foreground">
+                {{ t('userStats.members.active') }}
+              </div>
+              <div class="font-semibold">
+                {{ activeGroupMemberCount }}
+              </div>
+            </div>
+          </template>
         </div>
       </Card>
     </div>
 
-    <Card class="p-4 space-y-4">
+    <LeaderboardTable
+      v-if="scope === 'user_group'"
+      :title="t('userStats.memberLeaderboard')"
+      :items="memberLeaderboard"
+      :metric="metric"
+      :loading="memberLeaderboardLoading"
+      :show-metric-select="false"
+      selectable
+      @select="selectMember"
+    />
+
+    <Card class="space-y-4 p-4">
+      <div>
         <h3 class="text-sm font-semibold">
-        用户使用趋势
+          {{ scope === 'user' ? t('userStats.trend.user') : t('userStats.trend.userGroup') }}
         </h3>
+        <p class="mt-0.5 truncate text-xs text-muted-foreground">
+          {{ selectedEntityName || t('userStats.selectPrompt') }}
+        </p>
+      </div>
       <div
         v-if="seriesLoading"
         class="p-6"
@@ -131,10 +212,10 @@
 
     <Card
       v-if="comparisonSeries.length > 0"
-      class="p-4 space-y-4"
+      class="space-y-4 p-4"
     >
       <h3 class="text-sm font-semibold">
-        用户对比趋势
+        {{ scope === 'user' ? t('userStats.comparisonTrend.user') : t('userStats.comparisonTrend.userGroup') }}
       </h3>
       <div class="h-[280px]">
         <LineChart :data="comparisonChartData" />
@@ -144,27 +225,29 @@
 </template>
 
 <script setup lang="ts">
-import { ref, computed, onMounted, onUnmounted, watch } from 'vue'
-import { Card, Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from '@/components/ui'
+import { computed, onMounted, onUnmounted, ref, watch } from 'vue'
+import {
+  Button,
+  Card,
+  Select,
+  SelectContent,
+  SelectItem,
+  SelectTrigger,
+  SelectValue
+} from '@/components/ui'
 import LineChart from '@/components/charts/LineChart.vue'
 import { LoadingState, TimeRangePicker } from '@/components/common'
 import { LeaderboardTable } from '@/components/stats'
 import { adminApi, type LeaderboardItem } from '@/api/admin'
-import { usersApi, type User } from '@/api/users'
+import { usersApi, type User, type UserGroup, type UserGroupMember } from '@/api/users'
 import { usageApi } from '@/api/usage'
 import { formatCurrency, formatTokens } from '@/utils/format'
+import { useI18n } from '@/i18n'
 import { getDateRangeFromPeriod } from '@/features/usage/composables'
 import type { DateRangeParams } from '@/features/usage/types'
 
-const timeRange = ref<DateRangeParams>(getDateRangeFromPeriod('last7days'))
-const metric = ref<'requests' | 'tokens' | 'cost'>('requests')
-
-const users = ref<User[]>([])
-const selectedUserId = ref<string | null>(null)
-const compareUserId = ref<string>('__none__')
-
-const leaderboard = ref<LeaderboardItem[]>([])
-const leaderboardLoading = ref(false)
+type StatsScope = 'user' | 'user_group'
+type SelectableEntity = { id: string; name: string }
 
 interface UsageSummary {
   total_requests: number
@@ -178,21 +261,73 @@ interface TimeSeriesItem {
   total_cost: number
 }
 
-const userSummary = ref<UsageSummary | null>(null)
-const summaryLoading = ref(false)
+const { t } = useI18n()
 
+const PAGE_SIZE = 10
+const timeRange = ref<DateRangeParams>(getDateRangeFromPeriod('last7days'))
+const metric = ref<'requests' | 'tokens' | 'cost'>('requests')
+const scope = ref<StatsScope>('user')
+
+const users = ref<User[]>([])
+const userGroups = ref<UserGroup[]>([])
+const selectedUserId = ref('')
+const selectedUserGroupId = ref('')
+const compareUserId = ref('__none__')
+const compareUserGroupId = ref('__none__')
+
+const leaderboard = ref<LeaderboardItem[]>([])
+const leaderboardTotal = ref(0)
+const leaderboardOffset = ref(0)
+const leaderboardLoading = ref(false)
+const memberLeaderboard = ref<LeaderboardItem[]>([])
+const memberLeaderboardLoading = ref(false)
+const groupMemberCount = ref(0)
+const activeGroupMemberCount = ref(0)
+const usageSummary = ref<UsageSummary | null>(null)
+const summaryLoading = ref(false)
 const series = ref<TimeSeriesItem[]>([])
 const comparisonSeries = ref<TimeSeriesItem[]>([])
 const seriesLoading = ref(false)
+
 let leaderboardRequestId = 0
-let summaryRequestId = 0
-let seriesRequestId = 0
-let leaderboardLoadPromise: Promise<void> | null = null
-let hasPendingLeaderboardLoad = false
+let panelRequestId = 0
 let leaderboardDebounceTimer: ReturnType<typeof setTimeout> | null = null
-let userPanelsLoadPromise: Promise<void> | null = null
-let hasPendingUserPanelsLoad = false
-let userPanelsDebounceTimer: ReturnType<typeof setTimeout> | null = null
+let panelDebounceTimer: ReturnType<typeof setTimeout> | null = null
+let ready = false
+
+const allEntities = computed<SelectableEntity[]>(() => scope.value === 'user'
+  ? users.value.map(user => ({ id: user.id, name: user.username || user.email || user.id }))
+  : userGroups.value.map(group => ({ id: group.id, name: group.name })))
+
+const selectedEntityId = computed({
+  get: () => scope.value === 'user' ? selectedUserId.value : selectedUserGroupId.value,
+  set: (value: string) => {
+    if (scope.value === 'user') selectedUserId.value = value
+    else selectedUserGroupId.value = value
+  }
+})
+
+const compareEntityId = computed({
+  get: () => scope.value === 'user' ? compareUserId.value : compareUserGroupId.value,
+  set: (value: string) => {
+    if (scope.value === 'user') compareUserId.value = value
+    else compareUserGroupId.value = value
+  }
+})
+
+const comparisonEntities = computed(() => allEntities.value.filter(
+  entity => entity.id !== selectedEntityId.value
+))
+const selectedEntityName = computed(() => allEntities.value.find(
+  entity => entity.id === selectedEntityId.value
+)?.name ?? '')
+const comparedEntityName = computed(() => allEntities.value.find(
+  entity => entity.id === compareEntityId.value
+)?.name ?? '')
+const currentPage = computed(() => Math.floor(leaderboardOffset.value / PAGE_SIZE) + 1)
+const hasNextLeaderboardPage = computed(
+  () => leaderboardOffset.value + leaderboard.value.length < leaderboardTotal.value
+)
 
 function buildTimeRangeParams() {
   return {
@@ -205,136 +340,149 @@ function buildTimeRangeParams() {
   }
 }
 
-async function loadUsers() {
-  users.value = await usersApi.getAllUsers()
-  if (!selectedUserId.value && users.value.length > 0) {
-    selectedUserId.value = users.value[0].id
+function scopeParams(id: string) {
+  return scope.value === 'user' ? { user_id: id } : { user_group_id: id }
 }
+
+function ensureSelectedEntity() {
+  const entities = allEntities.value
+  if (!entities.some(entity => entity.id === selectedEntityId.value)) {
+    selectedEntityId.value = entities[0]?.id ?? ''
+  }
+  if (compareEntityId.value !== '__none__' && !entities.some(entity => entity.id === compareEntityId.value)) {
+    compareEntityId.value = '__none__'
+  }
+}
+
+async function loadEntities() {
+  const [loadedUsers, groupsResponse] = await Promise.all([
+    usersApi.getAllUsers(),
+    usersApi.listUserGroups()
+  ])
+  users.value = loadedUsers
+  userGroups.value = groupsResponse.items
+  ensureSelectedEntity()
 }
 
 async function loadLeaderboard() {
-  if (leaderboardLoadPromise) {
-    hasPendingLeaderboardLoad = true
-    return leaderboardLoadPromise
-  }
-  leaderboardLoadPromise = (async () => {
   const requestId = ++leaderboardRequestId
   leaderboardLoading.value = true
   try {
-    const response = await adminApi.getLeaderboardUsers({
+    const params = {
       ...buildTimeRangeParams(),
       metric: metric.value,
-      limit: 10
-    })
+      limit: PAGE_SIZE,
+      offset: leaderboardOffset.value
+    }
+    const response = scope.value === 'user'
+      ? await adminApi.getLeaderboardUsers(params)
+      : await adminApi.getLeaderboardUserGroups(params)
     if (requestId !== leaderboardRequestId) return
     leaderboard.value = response.items
+    leaderboardTotal.value = response.total
   } finally {
-    if (requestId === leaderboardRequestId) {
-      leaderboardLoading.value = false
+    if (requestId === leaderboardRequestId) leaderboardLoading.value = false
   }
 }
-  })().finally(() => {
-    leaderboardLoadPromise = null
-    if (hasPendingLeaderboardLoad) {
-      hasPendingLeaderboardLoad = false
-      void loadLeaderboard()
-    }
-  })
-  return leaderboardLoadPromise
-}
 
-async function loadSummary() {
-  if (!selectedUserId.value) return
-  const requestId = ++summaryRequestId
+async function loadPanels() {
+  const selectedId = selectedEntityId.value
+  const requestId = ++panelRequestId
+  if (!selectedId) {
+    usageSummary.value = null
+    series.value = []
+    comparisonSeries.value = []
+    memberLeaderboard.value = []
+    groupMemberCount.value = 0
+    activeGroupMemberCount.value = 0
+    return
+  }
   summaryLoading.value = true
-  try {
-    const summary = await usageApi.getUsageStats({
-      ...buildTimeRangeParams(),
-      user_id: selectedUserId.value
-    })
-    if (requestId !== summaryRequestId) return
-    userSummary.value = { ...summary, error_rate: summary.error_rate ?? 0 }
-  } finally {
-    if (requestId === summaryRequestId) {
-      summaryLoading.value = false
-    }
-  }
-}
-
-async function loadSeries() {
-  if (!selectedUserId.value) return
-  const requestId = ++seriesRequestId
   seriesLoading.value = true
+  memberLeaderboardLoading.value = scope.value === 'user_group'
   try {
-    const baseParams = {
-      ...buildTimeRangeParams(),
-      user_id: selectedUserId.value
-    }
-    const shouldCompare = Boolean(compareUserId.value && compareUserId.value !== '__none__')
-    const comparePromise: Promise<TimeSeriesItem[]> = shouldCompare
+    const primaryParams = { ...buildTimeRangeParams(), ...scopeParams(selectedId) }
+    const shouldCompare = compareEntityId.value !== '__none__'
+    const comparisonPromise: Promise<TimeSeriesItem[]> = shouldCompare
       ? adminApi.getTimeSeries({
         ...buildTimeRangeParams(),
-        user_id: compareUserId.value
+        ...scopeParams(compareEntityId.value)
       })
       : Promise.resolve([])
+    const memberPromise: Promise<{ items: LeaderboardItem[] }> = scope.value === 'user_group'
+      ? adminApi.getLeaderboardUsers({
+        ...buildTimeRangeParams(),
+        metric: metric.value,
+        user_group_id: selectedId,
+        limit: PAGE_SIZE
+      })
+      : Promise.resolve({ items: [] })
+    const groupMembersPromise: Promise<UserGroupMember[]> = scope.value === 'user_group'
+      ? usersApi.listUserGroupMembers(selectedId)
+      : Promise.resolve([])
 
-    const [primarySeries, compareSeries] = await Promise.all([
-      adminApi.getTimeSeries(baseParams),
-      comparePromise
+    const [summary, primarySeries, compareSeries, members, groupMembers] = await Promise.all([
+      usageApi.getUsageStats(primaryParams),
+      adminApi.getTimeSeries(primaryParams),
+      comparisonPromise,
+      memberPromise,
+      groupMembersPromise
     ])
-
-    if (requestId !== seriesRequestId) return
+    if (requestId !== panelRequestId) return
+    usageSummary.value = { ...summary, error_rate: summary.error_rate ?? 0 }
     series.value = primarySeries
     comparisonSeries.value = compareSeries
+    memberLeaderboard.value = members.items
+    groupMemberCount.value = groupMembers.filter(member => !member.is_deleted).length
+    activeGroupMemberCount.value = groupMembers.filter(
+      member => !member.is_deleted && member.is_active
+    ).length
   } finally {
-    if (requestId === seriesRequestId) {
+    if (requestId === panelRequestId) {
+      summaryLoading.value = false
       seriesLoading.value = false
+      memberLeaderboardLoading.value = false
     }
   }
 }
 
-async function loadUserPanels() {
-  if (userPanelsLoadPromise) {
-    hasPendingUserPanelsLoad = true
-    return userPanelsLoadPromise
+function selectLeaderboardItem(item: LeaderboardItem) {
+  selectedEntityId.value = item.id
 }
-  userPanelsLoadPromise = Promise.all([loadSummary(), loadSeries()])
-    .then(() => undefined)
-    .finally(() => {
-      userPanelsLoadPromise = null
-      if (hasPendingUserPanelsLoad) {
-        hasPendingUserPanelsLoad = false
-        void loadUserPanels()
+
+function selectMember(item: LeaderboardItem) {
+  scope.value = 'user'
+  selectedUserId.value = item.id
 }
-    })
-  return userPanelsLoadPromise
+
+function changeLeaderboardPage(direction: -1 | 1) {
+  leaderboardOffset.value = Math.max(0, leaderboardOffset.value + direction * PAGE_SIZE)
+  void loadLeaderboard()
 }
 
 const seriesChartData = computed(() => ({
   labels: series.value.map(item => item.date),
-  datasets: [
-    {
-      label: '成本',
+  datasets: [{
+    label: t('stats.metric.cost'),
     data: series.value.map(item => item.total_cost),
     borderColor: 'rgb(59, 130, 246)',
     tension: 0.25,
     pointRadius: 2
-    }
-  ]
+  }]
 }))
 
 const comparisonChartData = computed(() => ({
   labels: series.value.map(item => item.date),
   datasets: [
     {
-      label: '当前用户',
+      label: selectedEntityName.value || t('userStats.chart.current'),
       data: series.value.map(item => item.total_cost),
       borderColor: 'rgb(59, 130, 246)',
       tension: 0.25,
       pointRadius: 2
     },
     {
-      label: '对比用户',
+      label: comparedEntityName.value || t('userStats.chart.comparison'),
       data: comparisonSeries.value.map(item => item.total_cost),
       borderColor: 'rgb(234, 179, 8)',
       tension: 0.25,
@@ -344,50 +492,46 @@ const comparisonChartData = computed(() => ({
 }))
 
 function scheduleLeaderboardLoad() {
-  if (leaderboardDebounceTimer) {
-    clearTimeout(leaderboardDebounceTimer)
-  }
+  if (!ready) return
+  if (leaderboardDebounceTimer) clearTimeout(leaderboardDebounceTimer)
   leaderboardDebounceTimer = setTimeout(() => {
     leaderboardDebounceTimer = null
     void loadLeaderboard()
   }, 120)
 }
 
-function scheduleUserPanelsLoad() {
-  if (userPanelsDebounceTimer) {
-    clearTimeout(userPanelsDebounceTimer)
-  }
-  userPanelsDebounceTimer = setTimeout(() => {
-    userPanelsDebounceTimer = null
-    void loadUserPanels()
+function schedulePanelLoad() {
+  if (!ready) return
+  if (panelDebounceTimer) clearTimeout(panelDebounceTimer)
+  panelDebounceTimer = setTimeout(() => {
+    panelDebounceTimer = null
+    void loadPanels()
   }, 120)
 }
 
-watch([timeRange, metric], scheduleLeaderboardLoad, { deep: true })
-watch([timeRange, selectedUserId, compareUserId], scheduleUserPanelsLoad, { deep: true })
+watch(scope, () => {
+  leaderboardOffset.value = 0
+  ensureSelectedEntity()
+  scheduleLeaderboardLoad()
+  schedulePanelLoad()
+})
+watch([timeRange, metric], () => {
+  leaderboardOffset.value = 0
+  scheduleLeaderboardLoad()
+  schedulePanelLoad()
+}, { deep: true })
+watch([selectedEntityId, compareEntityId], schedulePanelLoad)
 
 onMounted(async () => {
-  await Promise.all([
-    loadLeaderboard(),
-    loadUsers()
-  ])
+  await loadEntities()
+  ready = true
+  await Promise.all([loadLeaderboard(), loadPanels()])
 })
 
 onUnmounted(() => {
-  if (leaderboardDebounceTimer) {
-    clearTimeout(leaderboardDebounceTimer)
-    leaderboardDebounceTimer = null
-  }
-  if (userPanelsDebounceTimer) {
-    clearTimeout(userPanelsDebounceTimer)
-    userPanelsDebounceTimer = null
-  }
-  hasPendingLeaderboardLoad = false
-  hasPendingUserPanelsLoad = false
-  leaderboardLoadPromise = null
-  userPanelsLoadPromise = null
+  if (leaderboardDebounceTimer) clearTimeout(leaderboardDebounceTimer)
+  if (panelDebounceTimer) clearTimeout(panelDebounceTimer)
   leaderboardRequestId += 1
-  summaryRequestId += 1
-  seriesRequestId += 1
+  panelRequestId += 1
 })
 </script>